Regardless of what you are invested in... pay attention to how much of your total investment... that any one investment makes up.

Consider this example...

Say you are entirely invested in one mutual fund.

If so... that means that you have 100% of your investment in that one basket.

Even though your fund may be an excellent fund that has served you well... you are "never the less"... exposed to the risk that something could change and your entire investment could suffer dramatically.